05000282/LER-1980-015-01, /01T-0:on 800429,containment Maint Airlock Showed Leakage Greater than Tech Spec Limit.Caused by Degradation of Airlock Door Seal.Inner Door Seals Replaced & Leak Tested Satisfactorily

/01T-0:on 800429,containment Maint Airlock Showed Leakage Greater than Tech Spec Limit.Caused by Degradation of Airlock Door Seal.Inner Door Seals Replaced & Leak Tested Satisfactorily

ML19323C630
Person / Time
Site:	Prairie Island
Issue date:	05/13/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19323C624	List: 05000282/LER-1980-015, Forwards LER 80-015/01T-0 05000282/LER-1980-015-01, /01T-0:on 800429,containment Maint Airlock Showed Leakage Greater than Tech Spec Limit.Caused by Degradation of Airlock Door Seal.Inner Door Seals Replaced & Leak Tested Satisfactorily
References
LER-80-015-01T-01, LER-80-15-1T-1, NUDOCS 8005160409
Download: ML19323C630 (2)

LER-1980-015, /01T-0:on 800429,containment Maint Airlock Showed Leakage Greater than Tech Spec Limit.Caused by Degradation of Airlock Door Seal.Inner Door Seals Replaced & Leak Tested Satisfactorily

Event date:
Report date:
2821980015R01 - NRC Website

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CRC FORM 384 U.E. NUCLEAR RE!tfLATORY COMMISS40N (7-77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 lA vninmotric test of the containment maintenance airlock showed leakage of about l

10131 1600 sccm vs. the Tech Soec limit of 409 secm.

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May 13, 1980 NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket No. 50-282 License No. DPR-42 Licensee Event Report 80-015 Supplemental Report Cause Description and Corrective Actions (contd.)

The volumetric test pressurizes the space between the doors. Thus, the test pressure tends to open the inner door. Also, door stops are installed prior to the test to pre-vent overcompression of (and damage to) the door seals. For these reasons it is concluded that door leakage would probably have been acceptable during the postulated accident.

However, this was not proved.

On May 1 a volumetric test of the personnel airlock also showed unacceptable results.

The same procedure was used for this test.

The procedure was then changed to perform the test without door stops and the measured leakage was zero.

The test procedure will be modified.

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